On DZone.com today there's a new post from Chris Shiflett sharing some timeless advice from an older copy of a PHP Quick Reference (published in 2009) about performance and security.

While cleaning out my desk, I found an old copy of a PHP Quick Reference I helped make a few years ago. On the front page are a few performance and security tips that I thought I'd share. (Performance tips are from George Schlossnagle.)

Performance tips include profile early/profile often, cache when possible and don't over-optimize. The security hints include some of the usual suspects - trust nothing, filter input/escape output and use prepared statements.